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. and that rainbow is another word for spectral-- spectrum of colors, yeah? and this will give us spectrum of colors too. it turns out it will give a spectrum of colors because it turns out different colors of light will travel at different speeds-- right. --through this material or any material. did you guys know the speed of light is less in glass and water than it is in air? and how come the light slows down when it gets to the glass or when it gets to the water or anything? and here's another thing. this used to bother me years ago. if the light slows down when it gets in the glass, how's it speed up when it comes out the other side? it seemed if you want to get light to slow down, get it on a piece of glass plates and at the end, you can just catch it in a bucket. that keep dribbling down, yeah? but how does the light speed up again? how does light get through glass? let me give you a little scenario of something like how that works. light is a throbbing spark of electromagnetic energy, huh? and that throbbing spark of electromagnetic energy has a certain frequency, at a certain frequency at wh
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